5421665 has 4 divisors (see below), whose sum is σ = 6506004. Its totient is φ = 4337328.

The previous prime is 5421659. The next prime is 5421667. The reversal of 5421665 is 5661245.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5661245 = 5 ⋅1132249.

It can be written as a sum of positive squares in 2 ways, for example, as 3972049 + 1449616 = 1993^2 + 1204^2 .

It is a cyclic number.

It is not a de Polignac number, because 5421665 - 2⁴ = 5421649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5421667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 542162 + ... + 542171.

It is an arithmetic number, because the mean of its divisors is an integer number (1626501).

Almost surely, 2^5421665 is an apocalyptic number.

It is an amenable number.

5421665 is a deficient number, since it is larger than the sum of its proper divisors (1084339).

5421665 is a wasteful number, since it uses less digits than its factorization.

5421665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084338.

The product of its digits is 7200, while the sum is 29.

The square root of 5421665 is about 2328.4469072753. The cubic root of 5421665 is about 175.6753765643.

The spelling of 5421665 in words is "five million, four hundred twenty-one thousand, six hundred sixty-five".